Worm/Mytob.LL - Worm

See also

Summary

Full description

Statistics

Virus:	Worm/Mytob.LL
Date discovered:	21/11/2005
Type:	Worm
In the wild:	Yes
Reported Infections:	High
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	56.832 Bytes
MD5 checksum:	ee4e6d2d64507089fea3768dca417738
VDF version:	6.32.00.200 - Sun, 20 Nov 2005 06:52 (GMT+1)

General Method of propagation:
   • Email

Aliases:
   • TrendMicro: WORM_MYTOB.MQ
   • Sophos: W32/Mytob-FO

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Blocks access to certain websites
   • Blocks access to security websites
   • Disable security applications
   • Uses its own Email engine
   • Registry modification
   • Third party control

Files It copies itself to the following location:
• %SYSDIR%\Fdd.exe

Registry The following registry keys are continuously in an infinite loop added in order to run the processes after reboot.

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "FDD SYSTEM"="Fdd.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "FDD SYSTEM"="Fdd.exe"

The following registry key is changed:

Deactivate Windows XP Firewall:
– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:

From:
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.

To:
– Email addresses found in specific files on the system.
– Generated addresses

Subject:
One of the following:
   • *DETECTED* Online User Violation
   • Email Account Suspension
   • Important Notification
   • Members Support
   • Notice of account limitation
   • Security measures
   • Warning Message: Your services near to be closed.
   • You have successfully updated your password
   • Your Account is Suspended
   • Your Account is Suspended For Security Reasons
   • Your new account password is approved
   • Your password has been successfully updated
   • Your password has been updated

In some cases the subject might also be empty.
Furthermore the subject line could contain random letters.

Body:
– Contains HTML code.
– In some cases it may contain random characters.
The body of the email is one of the following:

   • Dear user %username from receivers email address%,

     You have successfully updated the password of your %recipient's domain% account.

     If you did not authorize this change or if you need assistance with your account, please contact %recipient's domain% customer service at: admin@%recipient's domain%

     Thank you for using %recipient's domain%!
     The %recipient's domain% Support Team


     +++ Attachment: No Virus (Clean)
     +++ Yahoo Antivirus - www.%recipient's domain%

   • Dear user %username from receivers email address%,

     It has come to our attention that your %recipient's domain% User Profile ( x ) records are out of date. For further details see the attached document.

     Thank you for using %recipient's domain%!
     The %recipient's domain% Support Team


     +++ Attachment: No Virus (Clean)
     +++ Yahoo Antivirus - www.%recipient's domain%

   • Dear %recipient's domain% Member,

     Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experience and confirm the attached document so you will not run into any future problems with the online service.

     If you choose to ignore our request, you leave us no choice but to cancel your membership.

     Virtually yours,
     The %recipient's domain% Support Team


     +++ Attachment: No Virus found
     +++ Testvir Antivirus - www.%recipient's domain%

   • Dear %recipient's domain% Member,

     We have temporarily suspended your email account %reciever email address%.

     This might be due to either of the following reasons:

     1. A recent change in your personal information (i.e. change of address).
     2. Submiting invalid information during the initial sign up process.
     3. An innability to accurately verify your selected option of subscription due to an internal error within our processors.
     See the details to reactivate your Yahoo account.

     Sincerely,The %recipient's domain% Support Team



     +++ Attachment: No Virus (Clean)
     +++ Yahoo Antivirus - www.%recipient's domain%

Attachment:
The filename of the attachment is constructed out of the following:

– It starts with one of the following:
   • accepted-password
   • account-details
   • account-info
   • account-password
   • account-report
   • approved-password
   • document
   • email-details
   • email-password
   • important-details
   • new-password
   • password
   • readme
   • updated-password
   • %random character string%

Continued by one of the following in addition to several empty spaces:
   • .zip

Here are a few examples of how the filename of the attachment might look like:
   • password.zip
   • jjashdy.zip

The attachment is a copy of the malware itself.

Mailing Address generation for TO field:
To generate addresses it uses the following strings:
   • adam; alex; andrew; anna; bill; bob; brenda; brent; brian; claudia;
      dan; dave; david; debby; frank; fred; george; helen; jack; james;
      jane; jerry; jim; jimmy; joe; john; jose; josh; julie; kevin; leo;
      linda; maria; mary; matt; michael; mike; paul; peter; ray; robert;
      sales; sam; serg; smith; stan; steve; ted; tom

It combines the result with domains that were found in files, which were previously searched for addresses.

Here you can find examples of generated addresses:
   • tom@yahoo.com
   • stan@email.ro

Address generation for FROM field:
To generate addresses it uses the following strings:
   • admin
   • administrator
   • info
   • mail
   • register
   • service
   • support
   • webmaster

It combines the result with domains that were found in files, which were previously searched for addresses.

Here you can find examples of generated addresses:
   • admin@yahoo.com
   • support@email.ro

Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • -._!; -._!@; .edu; .gov; .mil; abuse; acketst; arin.; avp; be_loyal;
      berkeley; borlan; bsd; example; fcnz; fido; foo.; fsf.; gnu; google;
      gov.; hotmail; iana; ibm.com; icrosof; ietf; inpris; isc.o; isi.e;
      kernel; linux; math; mit.e; mozilla; msn.; mydomai; nodomai; panda;
      pgp; rfc-ed; ripe.; ruslis; secur; sendmail; sopho; spm; syma;
      tanford.e; unix; usenet; utgers.ed; www

IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: rax.**********hax.info
Port: 43287
Channel: #os
Nickname: [smptp-]-%six-digit random character string%
Password: r0x

– Furthermore it has the ability to perform the following action:
    • Download file
    • Execute file
    • Join IRC channel
    • Leave IRC channel
    • Send emails
    • Terminate process
    • Upload file
    • Visit a website

Hosts The host file is modified as explained:

– In this case already existing entries remain unmodified.

– Access to the following domains is effectively blocked:
   • avp.com; ca.com; customer.symantec.com; dispatch.mcafee.com;
      download.mcafee.com; ebay.com; f-secure.com; kaspersky.com;
      kaspersky-labs.com; liveupdate.symantec.com;
      liveupdate.symantecliveupdate.com; mast.mcafee.com; mcafee.com;
      microsoft.com; moneybookers.com; my-etrust.com; nai.com;
      networkassociates.com; pandasoftware.com; paypal.com; rads.mcafee.com;
      secure.nai.com; securityresponse.symantec.com; sophos.com;
      symantec.com; trendmicro.com; update.symantec.com;
      updates.symantec.com; us.mcafee.com; viruslist.com; viruslist.com;
      virustotal.com; www.amazon.ca; www.amazon.co.uk; www.amazon.com;
      www.amazon.fr; www.avp.com; www.ca.com; www.ebay.com;
      www.f-secure.com; www.grisoft.com; www.kaspersky.com; www.mcafee.com;
      www.microsoft.com; www.moneybookers.com; www.my-etrust.com;
      www.nai.com; www.networkassociates.com; www.pandasoftware.com;
      www.paypal.com; www.sophos.com; www.symantec.com; www.trendmicro.com;
      www.viruslist.com; www.virustotal.com

Process termination List of processes that are terminated:
   • _AVP32.EXE; _AVPCC.EXE; _AVPM.EXE; ACKWIN32.EXE; ADAWARE.EXE;
      ADVXDWIN.EXE; AGENTSVR.EXE; AGENTW.EXE; ALERTSVC.EXE; ALEVIR.EXE;
      ALOGSERV.EXE; AMON9X.EXE; ANTI-TROJAN.EXE; ANTIVIRUS.EXE; ANTS.EXE;
      APIMONITOR.EXE; APLICA32.EXE; APVXDWIN.EXE; ARR.EXE; ATCON.EXE;
      ATGUARD.EXE; ATRO55EN.EXE; ATUPDATER.EXE; ATWATCH.EXE; AU.EXE;
      AUPDATE.EXE; AUTODOWN.EXE; AUTO-PROTECT.NAV80TRY.EXE; AUTOTRACE.EXE;
      AUTOUPDATE.EXE; AVCONSOL.EXE; AVE32.EXE; AVGCC32.EXE; AVGCTRL.EXE;
      AVGNT.EXE; AVGSERV.EXE; AVGSERV9.EXE; AVGUARD.EXE; AVGW.EXE;
      AVKPOP.EXE; AVKSERV.EXE; AVKSERVICE.EXE; AVKWCTl9.EXE; AVLTMAIN.EXE;
      AVNT.EXE; AVP.EXE; AVP32.EXE; AVPCC.EXE; AVPDOS32.EXE; AVPM.EXE;
      AVPTC32.EXE; AVPUPD.EXE; AVSCHED32.EXE; AVSYNMGR.EXE; AVWINNT.EXE;
      AVWUPD.EXE; AVWUPD32.EXE; AVWUPSRV.EXE; AVXMONITOR9X.EXE;
      AVXMONITORNT.EXE; AVXQUAR.EXE; BACKWEB.EXE; BARGAINS.EXE;
      BD_PROFESSIONAL.EXE; BEAGLE.EXE; BELT.EXE; BIDEF.EXE; BIDSERVER.EXE;
      BIPCP.EXE; BIPCPEVALSETUP.EXE; BISP.EXE; BLACKD.EXE; BLACKICE.EXE;
      BLSS.EXE; BOOTCONF.EXE; BOOTWARN.EXE; BORG2.EXE; BPC.EXE; BRASIL.EXE;
      BS120.EXE; BUNDLE.EXE; BVT.EXE; CCAPP.EXE; CCEVTMGR.EXE; CCPXYSVC.EXE;
      CDP.EXE; CFD.EXE; CFGWIZ.EXE; CFIADMIN.EXE; CFIAUDIT.EXE; CFINET.EXE;
      CFINET32.EXE; CLAW95CF.EXE; CLEAN.EXE; CLEANER.EXE; CLEANER3.EXE;
      CLEANPC.EXE; CLICK.EXE; CMD.EXE; CMD32.EXE; CMESYS.EXE; CMGRDIAN.EXE;
      CMON016.EXE; CONNECTIONMONITOR.EXE; CPD.EXE; CPF9X206.EXE;
      CPFNT206.EXE; CTRL.EXE; CV.EXE; CWNB181.EXE; CWNTDWMO.EXE;
      DATEMANAGER.EXE; DCOMX.EXE; DEFALERT.EXE; DEFSCANGUI.EXE;
      DEFWATCH.EXE; DEPUTY.EXE; DIVX.EXE; DLLCACHE.EXE; DLLREG.EXE;
      DOORS.EXE; DPF.EXE; DPFSETUP.EXE; DPPS2.EXE; DRWATSON.EXE;
      DRWEB32.EXE; DRWEBUPW.EXE; DSSAGENT.EXE; DVP95.EXE; DVP95_0.EXE;
      ECENGINE.EXE; EFPEADM.EXE; EMSW.EXE; ENT.EXE; ESAFE.EXE; ESCANHNT.EXE;
      ESCANV95.EXE; ESPWATCH.EXE; ETHEREAL.EXE; ETRUSTCIPE.EXE; EVPN.EXE;
      EXANTIVIRUS-CNET.EXE; EXE.AVXW.EXE; EXPERT.EXE; EXPLORE.EXE;
      FAMEH32.EXE; FAST.EXE; FCH32.EXE; FIH32.EXE; FINDVIRU.EXE;
      FIREWALL.EXE; FNRB32.EXE; FPROT.EXE; F-PROT.EXE; F-PROT95.EXE;
      FP-WIN.EXE; FP-WIN_TRIAL.EXE; FRW.EXE; FSAA.EXE; FSAV.EXE; FSAV32.EXE;
      FSAV530STBYB.EXE; FSAV530WTBYB.EXE; FSAV95.EXE; FSGK32.EXE; FSM32.EXE;
      FSMA32.EXE; FSMB32.EXE; F-STOPW.EXE; GATOR.EXE; GBMENU.EXE;
      GBPOLL.EXE; GENERICS.EXE; GMT.EXE; GUARD.EXE; GUARDDOG.EXE;
      HACKTRACERSETUP.EXE; HBINST.EXE; HBSRV.EXE; HOTACTIO.EXE;
      HOTPATCH.EXE; HTLOG.EXE; HTPATCH.EXE; HWPE.EXE; HXDL.EXE; HXIUL.EXE;
      IAMAPP.EXE; IAMSERV.EXE; IAMSTATS.EXE; IBMASN.EXE; IBMAVSP.EXE;
      ICLOADNT.EXE; ICMON.EXE; ICSUPP95.EXE; ICSUPPNT.EXE; IDLE.EXE;
      IEDLL.EXE; IEDRIVER.EXE; IEXPLORER.EXE; IFACE.EXE; IFW2000.EXE;
      INETLNFO.EXE; INFUS.EXE; INFWIN.EXE; INIT.EXE; INTDEL.EXE; INTREN.EXE;
      IOMON98.EXE; ISTSVC.EXE; JAMMER.EXE; JDBGMRG.EXE; JEDI.EXE;
      KAVLITE40ENG.EXE; KAVPERS40ENG.EXE; KAVPF.EXE; KAZZA.EXE;
      KEENVALUE.EXE; KERIO-PF-213-EN-WIN.EXE; KERIO-WRL-421-EN-WIN.EXE;
      KERIO-WRP-421-EN-WIN.EXE; KERNEL32.EXE; KILLPROCESSSETUP161.EXE;
      LAUNCHER.EXE; LDNETMON.EXE; LDPRO.EXE; LDPROMENU.EXE; LDSCAN.EXE;
      LNETINFO.EXE; LOADER.EXE; LOCALNET.EXE; LOCKDOWN.EXE;
      LOCKDOWN2000.EXE; LOOKOUT.EXE; LORDPE.EXE; LSETUP.EXE; LUALL.EXE;
      LUAU.EXE; LUCOMSERVER.EXE; LUINIT.EXE; LUSPT.EXE; MAPISVC32.EXE;
      MCAGENT.EXE; MCMNHDLR.EXE; MCSHIELD.EXE; MCTOOL.EXE; MCUPDATE.EXE;
      MCVSRTE.EXE; MCVSSHLD.EXE; MD.EXE; MFIN32.EXE; MFW2EN.EXE;
      MFWENG3.02D30.EXE; MGAVRTCL.EXE; MGAVRTE.EXE; MGHTML.EXE; MGUI.EXE;
      MINILOG.EXE; MMOD.EXE; MONITOR.EXE; MOOLIVE.EXE; MOSTAT.EXE;
      MPFAGENT.EXE; MPFSERVICE.EXE; MPFTRAY.EXE; MRFLUX.EXE; MSAPP.EXE;
      MSBB.EXE; MSBLAST.EXE; MSCACHE.EXE; MSCCN32.EXE; MSCMAN.EXE;
      MSCONFIG.EXE; MSDM.EXE; MSDOS.EXE; MSIEXEC16.EXE; MSINFO32.EXE;
      MSLAUGH.EXE; MSMGT.EXE; MSMSGRI32.EXE; MSSMMC32.EXE; MSSYS.EXE;
      MSVXD.EXE; MU0311AD.EXE; MWATCH.EXE; N32SCANW.EXE; NAV.EXE;
      NAVAP.NAVAPSVC.EXE; NAVAPSVC.EXE; NAVAPW32.EXE; NAVDX.EXE;
      NAVLU32.EXE; NAVNT.EXE; NAVSTUB.EXE; NAVW32.EXE; NAVWNT.EXE;
      NC2000.EXE; NCINST4.EXE; NDD32.EXE; NEC.EXE; NEOMONITOR.EXE;
      NEOWATCHLOG.EXE; NETARMOR.EXE; NETD32.EXE; NETINFO.EXE; NETMON.EXE;
      NETSCANPRO.EXE; NETSPYHUNTER-1.2.EXE; NETSTAT.EXE; NETUTILS.EXE;
      NISSERV.EXE; NISUM.EXE; NMAIN.EXE; NOD32.EXE; NORMIST.EXE;
      NORTON_INTERNET_SECU_3.0_407.EXE; NOTSTART.EXE;
      NPF40_TW_98_NT_ME_2K.EXE; NPFMESSENGER.EXE; NPROTECT.EXE;
      NPSCHECK.EXE; NPSSVC.EXE; NSCHED32.EXE; NSSYS32.EXE; NSTASK32.EXE;
      NSUPDATE.EXE; NT.EXE; NTRTSCAN.EXE; NTVDM.EXE; NTXconfig.EXE; NUI.EXE;
      NUPGRADE.EXE; NVARCH16.EXE; NVC95.EXE; NVSVC32.EXE; NWINST4.EXE;
      NWSERVICE.EXE; NWTOOL16.EXE; OLLYDBG.EXE; ONSRVR.EXE; OPTIMIZE.EXE;
      OSTRONET.EXE; OTFIX.EXE; OUTPOST.EXE; OUTPOSTINSTALL.EXE;
      OUTPOSTPROINSTALL.EXE; PADMIN.EXE; PANIXK.EXE; PATCH.EXE; PAVCL.EXE;
      PAVPROXY.EXE; PAVSCHED.EXE; PAVW.EXE; PCFWALLICON.EXE;
      PCIP10117_0.EXE; PCSCAN.EXE; PDSETUP.EXE; PERISCOPE.EXE; PERSFW.EXE;
      PERSWF.EXE; PF2.EXE; PFWADMIN.EXE; PGMONITR.EXE; PINGSCAN.EXE;
      PLATIN.EXE; POP3TRAP.EXE; POPROXY.EXE; POPSCAN.EXE; PORTDETECTIVE.EXE;
      PORTMONITOR.EXE; POWERSCAN.EXE; PPINUPDT.EXE; PPTBC.EXE; PPVSTOP.EXE;
      PRIZESURFER.EXE; PRMT.EXE; PRMVR.EXE; PROCDUMP.EXE;
      PROCESSMONITOR.EXE; PROCEXPLORERV1.0.EXE; PROGRAMAUDITOR.EXE;
      PROPORT.EXE; PROTECTX.EXE; PSPF.EXE; PURGE.EXE; QCONSOLE.EXE;
      QSERVER.EXE; RAPAPP.EXE; RAV7.EXE; RAV7WIN.EXE; RAV8WIN32ENG.EXE;
      RAY.EXE; RB32.EXE; RCSYNC.EXE; REALMON.EXE; REGED.EXE; REGEDIT.EXE;
      REGEDT32.EXE; RESCUE.EXE; RESCUE32.EXE; RRGUARD.EXE; RSHELL.EXE;
      RTVSCAN.EXE; RTVSCN95.EXE; RULAUNCH.EXE; RUN32DLL.EXE; RUNDLL.EXE;
      RUNDLL16.EXE; RUXDLL32.EXE; SAFEWEB.EXE; SAHAGENT.EXE; SAVE.EXE;
      SAVENOW.EXE; SBSERV.EXE; SC.EXE; SCAM32.EXE; SCAN32.EXE; SCAN95.EXE;
      SCANPM.EXE; SCRSCAN.EXE; SETUP_FLOWPROTECTOR_US.EXE;
      SETUPVAMEEVAL.EXE; SFC.EXE; SGSSFW32.EXE; SH.EXE; SHELLSPYINSTALL.EXE;
      SHN.EXE; SHOWBEHIND.EXE; SMC.EXE; SMS.EXE; SMSS32.EXE; SOAP.EXE;
      SOFI.EXE; SPERM.EXE; SPF.EXE; SPHINX.EXE; SPOLER.EXE; SPOOLCV.EXE;
      SPOOLSV32.EXE; SPYXX.EXE; SREXE.EXE; SRNG.EXE; SS3EDIT.EXE;
      SSG_4104.EXE; SSGRATE.EXE; ST2.EXE; START.EXE; STCLOADER.EXE;
      SUPFTRL.EXE; SUPPORT.EXE; SUPPORTER5.EXE; SVC.EXE; SVCHOSTC.EXE;
      SVCHOSTS.EXE; SVSHOST.EXE; SWEEP95.EXE;
      SWEEPNET.SWEEPSRV.SYS.SWNETSUP.EXE; SYMPROXYSVC.EXE; SYMTRAY.EXE;
      SYSEDIT.EXE; SYSTEM.EXE; SYSTEM32.EXE; SYSUPD.EXE; TASKMG.EXE;
      TASKMGR.EXE; TASKMO.EXE; TASKMON.EXE; TAUMON.EXE; TBSCAN.EXE; TC.EXE;
      TCA.EXE; TCM.EXE; TDS2-NT.EXE; TDS-3.EXE; TEEKIDS.EXE; TFAK.EXE;
      TFAK5.EXE; TGBOB.EXE; TITANIN.EXE; TITANINXP.EXE; TRACERT.EXE;
      TRICKLER.EXE; TRJSCAN.EXE; TRJSETUP.EXE; TROJANTRAP3.EXE; TSADBOT.EXE;
      TVMD.EXE; TVTMD.EXE; UNDOBOOT.EXE; UPDAT.EXE; UPDATE.EXE; UPGRAD.EXE;
      UTPOST.EXE; VBCMSERV.EXE; VBCONS.EXE; VBUST.EXE; VBWIN9X.EXE;
      VBWINNTW.EXE; VCSETUP.EXE; VET32.EXE; VET95.EXE; VETTRAY.EXE;
      VFSETUP.EXE; VIR-HELP.EXE; VIRUSMDPERSONALFIREWALL.EXE; VNLAN300.EXE;
      VNPC3000.EXE; VPC32.EXE; VPC42.EXE; VPFW30S.EXE; VPTRAY.EXE;
      VSCAN40.EXE; VSCENU6.02D30.EXE; VSCHED.EXE; VSECOMR.EXE; VSHWIN32.EXE;
      VSISETUP.EXE; VSMAIN.EXE; VSMON.EXE; VSSTAT.EXE; VSWIN9XE.EXE;
      VSWINNTSE.EXE; VSWINPERSE.EXE; W32DSM89.EXE; W9X.EXE; WATCHDOG.EXE;
      WEBDAV.EXE; WEBSCANX.EXE; WEBTRAP.EXE; WFINDV32.EXE;
      WHOSWATCHINGME.EXE; WIMMUN32.EXE; WIN32.EXE; WIN32US.EXE;
      WINACTIVE.EXE; WIN-BUGSFIX.EXE; WINDOW.EXE; WINDOWS.EXE; WININETD.EXE;
      WININIT.EXE; WININITX.EXE; WINLOGIN.EXE; WINMAIN.EXE; WINNET.EXE;
      WINPPR32.EXE; WINRECON.EXE; WINSERVN.EXE; WINSSK32.EXE; WINSTART.EXE;
      WINSTART001.EXE; WINTSK32.EXE; WINUPDATE.EXE; WKUFIND.EXE; WNAD.EXE;
      WNT.EXE; WRADMIN.EXE; WRCTRL.EXE; WSBGATE.EXE; WUPDATER.EXE;
      WUPDT.EXE; WYVERNWORKSFIREWALL.EXE; XPF202EN.EXE; ZAPRO.EXE;
      ZAPSETUP3001.EXE; ZATUTOR.EXE; ZONALM2601.EXE; ZONEALARM.EXE

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• PESpin

See a brief description here.

Description inserted by Iulian Popa on Mon, 21 Nov 2005 16:03 (GMT+1)
Description updated by Iulian Popa on Wed, 23 Nov 2005 08:37 (GMT+1)

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